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2 Sheets-Sheet l Oct 6, 1942- s. s. KwoLEK GRATE Filed OC'E. 13, 1939 INVENTOR. STEPHEN 5. KWOLEK l /s Afroe/VEY OGL 6, 1942- s, s. KwoLEK GRATE 1939 2 Sheets-Sheet 2 Filed 0G13. 13

INVENT OR. 3. KWOLEK STEPHEN l HIS ATToQ/VEY V.. Y B

Patented Oct. 6, 1942 UNITED STATES PATENT OFFICE GRATE Stephen S. Kwolek, Detroit, Mich. Application october 1s, 1939,l serial No. 299,313

4 Claims.

My invention relates to a new and useful irnprovement in a grate adapted for use on furnaces in which solid fuel is used and in which the grate serves as a support for the combusting fuel or as a support for the residue or ash o f the combusted fuel. The grate is of the planar surface type, that is, the upper surface is formed from a plate-like body so that a fiat supporting surface for the fuel or ash is provided. In this type of grate air is delivered from below the grate and forced to pass through openings formed in the grate body, these openings being located uniformly over the area ofthe grate so that a uniform distribution of air under pressure to the combusting fuel is effected.

The present invention is particularly adapted as a heavy duty grate and is especially adapted for use with overfed sprinkler type stokers. The grate is illustrated as of the dump type in which the various sections of the grate may be rocked to discharge ash or other accumulation on thel surface thereof downwardly into the compartment positioned below.

It is an object of the present invention to provide a grate carrier bar and grate sections assembled thereon in such a manner that the formation of holes through the carrier bar becomes unnecessary, thus assuring the maximum strength in the carrier bar and reducing the cost of manufacture thereof.

Another object of the invention is the provision of a grate assembly in which the carrier bar may be formed from stock material with the grate machined to t over the same so that accuracy in assembly may be obtained.

Another object of the invention is the provision in a grate assembly of a grate carrier bar having grate sections mounted thereon by means of fastening members which embrace the carrier bar.

Another object of the invention is the provision in a grate assembly of a plurality of grateforming sections arranged in juxtaposition with yieldable packing material between them for assuring a sealed engagement and at the same time providing for the necessary expansion space.

Another object of the invention is the provision of a grate assembly consisting of a plurality of rockable sections so arranged and constructed that binding of adjacent sections together during use is eliminated.

Another object of the invention is the provision in a grate assembly of a plurality of rockably mounted grate-forming sections having trunnions journalled on bearing blocks .and provided With a shield for each of the bearing blocks. y

Another object of the invention "is the provision of a grate assembly of this Aclass having a maximum area and presenting no obstructions to the free passage of air through the grate body at the openings formed therein.

Another object of the invention is the provision of a heavy duty grate in which the weight will be reduced to a minimum and in which high efiiciency of operation may be obtained.

Other objects will appear hereinafter.

Fig. 1 is a `longitudinal section view of 'a grate assembly embodying the invention, with parts broken away, parts shown in section, and parts shown in side elevation;

Fig. 2 isa view similar tov Fig. 1 showing other parts in side elevation and illustrating some of the grate sections in dumping position;

Fig. 3 is a fragmentary transverse sectional view of a grate assembly .embodying the invention, with parts broken away and parts shown in side elevation;

Fig. 4 is a'. fragmentary sectional View of a grate assembly embodying the invention illustrating the bridge wall tuy'res;

Fig. 5 isa perspective View of a bearing shielding section;

Fig. 6 is a fragmentary perspective view of a dumping section;

Fig. 7 is a perspective view of a bridge wall section.

In the drawings I have illustrated the invention used with a furnace having la front wall I4 and a bridge wall I6, an air chamber or ash pit I1 positioned below the top of the grate, and supporting I-beams I8. In the assembly illustrated I use different types of grate sections. The main body of the grate is formed from the section I9 shown in Fig. 6, which may be termed the dumping grate or the dumping grate section. In the assembly at the walls I use a bridge wall section 2t)A illustrated in Fig. 7, and at the bearings I u'se a bearing section or shield 2l illustrated in Fig. 5. All of the sections may be said to be of box-like construction. The dumping sections comprise the upper wall 22, the side walls 23, and the end walls 24. Projecting downwardly from the plate or top 22 are the fins or partitions 25 which serve to divide the box-like construction into a plurality of smaller box-like constructions or compartments to resemble a honeycomb type of construction when viewed from the bottom. The end walls 24 are provided with the notches 26 machined to i; over the square or nat-faced carrier bar 2'I which is machined into cylindrical formation at the ends, the cylindrical ends fitting into bearing blocks 28 supported by the I-beams I8. These carrier bars are adapted to be rocked in a well-known manner by arms 29 which depend therefrom and which are connected to each other by the connecting bar 3B, the rocking 0f the grates being effected manually, hydraulically, or in any other suitable manner. When the grates are in operative position the bar 35 is rocked to the position shown in Fig. 1. By moving the bar 30 to the right of Fig. 1 the grates may be rocked into an upright or inclined position as diagrammatically illustrated in Fig. 2, in which position the accumulation on the upper surfaceY ofV the plate 22 may be dumped into the compartment II. Over each of the pillow blocks 28 is mounted one of the sections 2l which serves as a shield for the pillow block and prevents undue heating. The section 2I is provided with the openings 2l' formed therein through which air is constantly being directed while the grate is in use, with the result that since the pillow blocks do not become heated, a binding of the carrier bars in their journallings is avoided,

At the bridge wall I6 I use a section illustrated in Fig. '7, the inwardly turned anges 33 serving as a means for bolting the section to the supporting I-beams I8.

The grate sections 22 are provided with grooves 34 von the upper surface, each of these grooves communicating with a pair of spaced openings 35 so that a U bolt 35 may be projected therethrough and through a clamping plate 3T whereby the grate section may be secured to the carrier bar 27. By having the groove 34 formed in the upper face of the plate Y22, an unobstructed upper surface is afforded. A plurality of openings 38 is formed in these sections through which air may be directed in a well-known manner. Each section is provided on its opposite sides with yan engaging iiange 39 and an engagement flange dil, the engaging flange of one section engaging against the engagement flange 4l] of the adjacent section so as to assure an air-tight connection and prevent leakage of air between the sections. The engagement flange 40 may be provided with a packing of asbestos or the like whereby a sealing connection may be effected.

Adjacent grate sections on the same carrier bar are also sealed at their opposite sides, the sections having registering grooves 413, the space l5 being provided for the insertion of suitable packing as asbestos. At the wall I4 I provide a stationary hearth plate or dead plate.

It is believed obvious from the illustration given that there is none of the surface of the grate which is obstructed and that the distribution of air throughout the entire area of the grate from wall to wall becomes possible. By having the grate sections forming with each other a substantially leak-proof engagement, it becomes possible to utilize these sections together with the I-beams I8 as a means for dividing the furnace into various sections so that when a light load is encountered some of the sections may be cut out of service without disturbing the operation of the other sections.

It will be noted that there are no upwardly projecting side bearings extending above the bearing face or upper surface of the grate so that the heating of the bearings is prevented, and there is no dead space on the surface of the grate.

What I claim as new is: y

1. A girate construction of the class described comprising; spaced apart supporting members; a bearing mounted on and projecting upwardly from each of said supporting members; a rockable shaft extending between and journalled in said bearings; means for rocking said shaft; a plurality of grate sections positioned between said bearings above said shaft and connected to said shaft; and a stationary grate section at each of said bearings overlying said bearing and having downwardly projecting side walls for shielding the opposite sides of said bearing.

2. A grate construction of the class described comprising: spaced apart supporting members; a bearing mounted on and projecting upwardly from each of said supporting members; a shaft journalled at its opposite ends in said bearings and lying between said bearings; means for rocking said shaft; a plurality of grate sections having openings formed therethrough and positioned 'over said shaft; means for securing said sections to said shaft; and a box-like construction with a closed top and an open bottom mounted on said supporting members at each of said bearings overlying and partially enclosing the same and having openings formed in its top.

3. In a grate construction of the class described, spaced apart stationary bearings; a shaft extending between and journalled at its opposite ends in said bearings; a grate section positioned between said bearings above said shaft and having a plurality of openings formed therethrough; means for connecting the grate section to said shaft; a stationary shield comprising a box-like construction having a closed top and an open bottom positioned over each of said bearings and having openings formed in its top, the outer face of the top thereof lying in alignment with the upper face of the grate section and forming therewith a continuation of the grate surface.

4. In a grate construction of the class described, spaced apart stationary bearings; a shaft extending between and journalled in said bearings; means for rocking said shaft; a grate surface embodying a plurality of grate sections positioned over said shaft; means for securing said sections to said shaft, each of said sections having a plurality of openings formed therein and the upper surface forming the supporting surface of the grate; a stationary box-like structure, having a closed top and an open bottom, positioned over each of said bearings and having a plurality of openings formed in its top, the outer face of said top forming a continuation of the supporting surfaces of said grate sections; and a depending partition member extending downwardly from said stationary shield on opposite sides of said bearing for shielding the same, one of said partitions having a notch formed therein for accommodating said shaft.

STEPHEN S. KWOLEK. 

